Deutsche Forschungs- Und Versuchsanstalt Fur Luft- Und Raumfahrt E.v.

Carl Baasel Lasertechnik Gmbh

Peter Hoffmann

Schock, Wolfram

Wolfgang Schall

Helmut Hugel

Apparatus for conducting a gas mixture in a closed circuit

An unstable laser resonator having two spherical mirrors for producing a collimated output beam with rotationally unsymmetrical magnification characterized by the inclusion between the two spherical mirrors of at least two other optical elements with cylindrical surfaces and wherein the cylindrical axes of said cylindrical surfaces are essentially perpendicular to each other. These other two optical elements may be mirrors or lenses.

Unstable laser resonator

Disclosure is directed to an apparatus for producing a microwave discharge n a supersonic gas flow such that the available microwave energy is deposited in the gas as completely and uniformly as possible through a substantial cross-section of the flow channel. The flow channel is provided within a waveguide and microwave energy is caused to be propagated through the waveguide substantially in the direction of the gas flow. A supersonic nozzle is provided in the channel dividing the channel into an upstream plenum and a downstream low pressure region, and the electric discharge occurs in the low pressure region just beyond the nozzle throat.

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Stuttgart, Germany

Peter Hoffmann